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254 volume VI os16 Script e sorgenti del kernel 255 « « 1290015 | dsk_table[1].heads = 2; 1290016 | dsk_table[1].sectors = 18; 1290017 | dsk_table[1].retry = 3; 1290018 | dsk_reset (2); 1290019 | dsk_table[2].bios_drive = 0x80; // C: like a 2880 Kibyte floppy disk. 1290020 | dsk_table[2].cylinders = 80; 1290021 | dsk_table[2].heads = 2; 1290022 | dsk_table[2].sectors = 36; 1290023 | dsk_table[2].retry = 3; 1290024 | dsk_reset (3); 1290025 | dsk_table[3].bios_drive = 0x81; // D: like a 2880 Kibyte floppy disk. 1290026 | dsk_table[3].cylinders = 80; 1290027 | dsk_table[3].heads = 2; 1290028 | dsk_table[3].sectors = 36; 1290029 | dsk_table[3].retry = 3; 1290030 |} 104.5.30 kernel/ibm_i86/dsk_table.c Si veda la sezione 103.4. 1300001 |#include 1300002 |//---------------------------------------------------------------------- 1300003 |dsk_t dsk_table[DSK_MAX]; 104.5.31 kernel/ibm_i86/dsk_write_bytes.c Si veda la sezione 103.4. 1320025 | buffer, n_sectors - remaining); 1320026 | } 1320027 | return (status); 1320028 | } 1320029 | else 1320030 | { 1320031 | for (retry = 0; retry < dsk_table[drive].retry; retry++) 1320032 | { 1320033 | status = int13_03 (dsk_table[drive].bios_drive, n_sectors, 1320034 | chs.cylinder, chs.head, chs.sector, 1320035 | buffer); 1320036 | status = status & 0x00F0; 1320037 | if (status == 0) 1320038 | { 1320039 | break; 1320040 | } 1320041 | else 1320042 | { 1320043 | dsk_reset (drive); 1320044 | } 1320045 | } 1320046 | } 1320047 | if (status == 0) 1320048 | { 1320049 | return (0); 1320050 | } 1320051 | else 1320052 | { 1320053 | return (-1); 1320054 | } 1320055 |} « 1310001 |#include 1310002 |#include 1310003 |#include 1310004 |#include 1310005 |#include 1310006 |//---------------------------------------------------------------------- 1310007 |size_t 1310008 |dsk_write_bytes (int drive, off_t offset, void *buffer, size_t count) 1310009 |{ 1310010 | unsigned char *data_buffer = (unsigned char *) buffer; 1310011 | int status; 1310012 | unsigned int sector; 1310013 | unsigned char sector_buffer[DSK_SECTOR_SIZE]; 1310014 | int i; 1310015 | int j = 0; 1310016 | size_t k = 0; 1310017 | size_t m = 0; 1310018 | 1310019 | sector = offset / DSK_SECTOR_SIZE; 1310020 | i = offset % DSK_SECTOR_SIZE; 1310021 | status = dsk_read_sectors (drive, sector, sector_buffer, 1); 1310022 | 1310023 | if (status != 0) 1310024 | { 1310025 | return ((size_t) 0); 1310026 | } 1310027 | 1310028 | while (count) 1310029 | { 1310030 | m = k; 1310031 | for (; i < DSK_SECTOR_SIZE && count > 0; 1310032 | i++, j++, k++, count--, offset++) 1310033 | { 1310034 | sector_buffer[i] = data_buffer[j]; 1310035 | } 1310036 | status = dsk_write_sectors (drive, sector, sector_buffer, 1); 1310037 | if (status != 0) 1310038 | { 1310039 | return (m); 1310040 | } 1310041 | if (count) 1310042 | { 1310043 | sector = offset / DSK_SECTOR_SIZE; 1310044 | i = offset % DSK_SECTOR_SIZE; 1310045 | status = dsk_read_sectors (drive, sector, sector_buffer, 1); 1310046 | if (status != 0) 1310047 | { 1310048 | return (m); 1310049 | } 1310050 | } 1310051 | } 1310052 | return (k); 1310053 |} 1310054 | 1310055 | 104.5.32 kernel/ibm_i86/dsk_write_sectors.c Si veda la sezione 103.4. 1320001 |#include 1320002 |#include 1320003 |#include 1320004 |#include 1320005 |#include 1320006 |//---------------------------------------------------------------------- 1320007 |int 1320008 |dsk_write_sectors (int drive, unsigned int start_sector, void *buffer, 1320009 | unsigned int n_sectors) 1320010 |{ 1320011 | int status; 1320012 | unsigned int retry; 1320013 | unsigned int remaining; 1320014 | dsk_chs_t chs; 1320015 | dsk_sector_to_chs (drive, start_sector, &chs); 1320016 | remaining = dsk_table[drive].sectors - chs.sector + 1; 1320017 | if (remaining < n_sectors) 1320018 | { 1320019 | status = dsk_write_sectors (drive, start_sector, 1320020 | buffer, remaining); 1320021 | if (status == 0) 1320022 | { 1320023 | status = dsk_write_sectors (drive, 1320024 | start_sector + remaining, 104.5.33 kernel/ibm_i86/irq_off.c Si veda la sezione 103.4. 1330001 |#include 1330002 |#include 1330003 |#include 1330004 |#include 1330005 |#include 1330006 |//---------------------------------------------------------------------- 1330007 |void 1330008 |irq_off (unsigned int irq) 1330009 |{ 1330010 | unsigned int mask; 1330011 | unsigned int status; 1330012 | if (irq > 7) 1330013 | { 1330014 | return; // Only XT IRQs are handled. 1330015 | } 1330016 | else 1330017 | { 1330018 | mask = (1 7) 1340013 | { 1340014 | return; // Only XT IRQs are handled. 1340015 | } 1340016 | else 1340017 | { 1340018 | mask = ~(1
256 volume VI os16 Script e sorgenti del kernel 257 1350022 |int k_vsprintf (char *restrict string, const char *restrict format, 1410012 | return; 1350023 | va_list arg); 1410013 | } 1350024 |void k_perror (const char *s); 1350025 | 1410014 | // 1410015 | // Show the string if there is one. 1350026 |int k_kill (pid_t pid, int sig); 1410016 | // 1350027 |int k_open (const char *file, int oflags, ...); 1410017 | if (s != NULL && strlen (s) > 0) 1350028 |void k_close (int fd); 1410018 | { 1350029 |ssize_t k_read (int fd, void *buffer, size_t count); 1410019 | k_printf ("%s: ", s); 1350030 |//---------------------------------------------------------------------- 1350031 | 1410020 | } 1410021 | // 1350032 |#endif 1410022 | // Show the translated error. 1410023 | // 1410024 | if (errfn[0] != 0 && errln != 0) 104.6.1 kernel/k_libc/k_clock.c 1410025 | { 1410026 | k_printf ("[%s:%u:%i] %s\n", « Si veda la sezione 103.5. 1360001 |#include 1360002 |//---------------------------------------------------------------------- 1360003 |extern clock_t _clock_ticks; // uint32_t 1360004 |//---------------------------------------------------------------------- 1360005 |clock_t 1410027 | errfn, errln, errno, strerror (errno)); 1410028 | } 1410029 | else 1410030 | { 1410031 | k_printf ("[%i] %s\n", errno, strerror (errno)); 1410032 | } 1410033 |} 1360006 |k_clock (void) 1360007 |{ 1360008 | return (_clock_ticks); 1360009 |} 104.6.7 kernel/k_libc/k_printf.c « Si veda la sezione 103.5. 104.6.2 kernel/k_libc/k_close.c 1420001 |#include 1420002 |#include « Si veda la sezione 103.5. 1370001 |#include 1370002 |#include 1370003 |//---------------------------------------------------------------------- 1370004 |void 1370005 |k_close (int fdn) 1370006 |{ 1420003 |//---------------------------------------------------------------------- 1420004 |int 1420005 |k_printf (const char *restrict format, ...) 1420006 |{ 1420007 | va_list ap; 1420008 | va_start (ap, format); 1420009 | return k_vprintf (format, ap); 1420010 |} 1370007 | fd_close ((pid_t) 0, fdn); 1370008 | return; 1370009 |} 104.6.8 kernel/k_libc/k_puts.c « 104.6.3 kernel/k_libc/k_exit.s Si veda la sezione 103.5. 1430001 |#include « Si veda la sezione 103.5. 1380001 |.global _k_exit 1380002 |;----------------------------------------------------------------------- 1380003 |.text 1380004 |;----------------------------------------------------------------------- 1380005 |.align 2 1380006 |_k_exit: 1380007 |halt: 1380008 | hlt 1380009 | jmp halt 1430002 |#include 1430003 |#include 1430004 |#include 1430005 |//---------------------------------------------------------------------- 1430006 |int 1430007 |k_puts (const char *string) 1430008 |{ 1430009 | dev_io ((pid_t) 0, DEV_TTY, DEV_WRITE, (off_t) 0, string, 1430010 | strlen (string), NULL); 1430011 | dev_io ((pid_t) 0, DEV_TTY, DEV_WRITE, (off_t) 0, "\n", 1, NULL); 1430012 | return 1; 1430013 |} « 104.6.4 kernel/k_libc/k_kill.c 104.6.9 kernel/k_libc/k_read.c Si veda la sezione 103.5. 1390001 |#include 1390002 |#include 1390003 |//---------------------------------------------------------------------- 1390004 |int 1390005 |k_kill (pid_t pid, int sig) 1390006 |{ 1390007 | return (proc_sys_kill ((pid_t) 0, pid, sig)); 1390008 |} Si veda la sezione 103.5. 1440001 |#include 1440002 |#include 1440003 |//---------------------------------------------------------------------- 1440004 |ssize_t 1440005 |k_read (int fdn, void *buffer, size_t count) 1440006 |{ 1440007 | int eof; 1440008 | ssize_t size; « 1440009 | // « 104.6.5 kernel/k_libc/k_open.c Si veda la sezione 103.5. 1400001 |#include 1400002 |#include 1400003 |#include 1400004 |#include 1400005 |#include 1400006 |//---------------------------------------------------------------------- 1400007 |int 1400008 |k_open (const char *file, int oflags, ...) 1440010 | eof = 0; 1440011 | // 1440012 | while (1) 1440013 | { 1440014 | size += fd_read ((pid_t) 0, fdn, buffer, count, &eof); 1440015 | if (size != 0 || eof) 1440016 | { 1440017 | break; 1440018 | } 1440019 | } 1440020 | return (size); 1440021 |} 1400009 |{ 1400010 | mode_t mode; 1400011 | va_list ap; 1400012 | // 1400013 | va_start (ap, oflags); 1400014 | mode = va_arg (ap, mode_t); 1400015 | // 1400016 | if (file == NULL || strlen (file) == 0) 1400017 | { 1400018 | errset (EINVAL); // Invalid argument. 1400019 | return (-1); 1400020 | } 1400021 | return (fd_open ((pid_t) 0, file, oflags, mode)); 1400022 |} 104.6.10 kernel/k_libc/k_stime.c Si veda la sezione 103.5. 1450001 |#include 1450002 |//---------------------------------------------------------------------- 1450003 |extern time_t _clock_seconds; // uint32_t 1450004 |//---------------------------------------------------------------------- 1450005 |int 1450006 |k_stime (time_t *timer) 1450007 |{ 1450008 | _clock_seconds = *timer; 1450009 | return (0); « 1450010 |} 104.6.6 kernel/k_libc/k_perror.c « Si veda la sezione 103.5. 1410001 |#include 1410002 |#include 1410003 |//---------------------------------------------------------------------- 1410004 |void 1410005 |k_perror (const char *s) 1410006 |{ 1410007 | // 1410008 | // If errno is zero, there is nothing to show. 1410009 | // 1410010 | if (errno == 0) 1410011 | { 104.6.11 kernel/k_libc/k_time.c Si veda la sezione 103.5. 1460001 |#include 1460002 |#include 1460003 |//---------------------------------------------------------------------- 1460004 |extern time_t _clock_seconds; // uint32_t 1460005 |//---------------------------------------------------------------------- 1460006 |time_t 1460007 |k_time (time_t *timer) 1460008 |{ 1460009 | if (timer != NULL) «
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